首页 > 代码库 > iOS8 中的通知：Notification 草稿，正在整理中。。。。
iOS8 中的通知：Notification 草稿，正在整理中。。。。
在ios8中，有了关于本地通知和远程通知的新改动，下面来看看。
先看一段网上抄来的代码
UIMutableUserNotificationAction *notificationAction1 = [[UIMutableUserNotificationAction alloc] init]; notificationAction1.identifier = @"Accept"; notificationAction1.title = @"Accept"; notificationAction1.activationMode = UIUserNotificationActivationModeBackground; notificationAction1.destructive = NO; notificationAction1.authenticationRequired = NO; UIMutableUserNotificationAction *notificationAction2 = [[UIMutableUserNotificationAction alloc] init]; notificationAction2.identifier = @"Reject"; notificationAction2.title = @"Reject"; notificationAction2.activationMode = UIUserNotificationActivationModeBackground; notificationAction2.destructive = YES; notificationAction2.authenticationRequired = YES; UIMutableUserNotificationAction *notificationAction3 = [[UIMutableUserNotificationAction alloc] init]; notificationAction3.identifier = @"Reply"; notificationAction3.title = @"Reply"; notificationAction3.activationMode = UIUserNotificationActivationModeForeground; notificationAction3.destructive = NO; notificationAction3.authenticationRequired = YES; UIMutableUserNotificationCategory *notificationCategory = [[UIMutableUserNotificationCategory alloc] init]; notificationCategory.identifier = @"Email"; // [notificationCategory setActions:@[notificationAction3] forContext:UIUserNotificationActionContextDefault]; [notificationCategory setActions:@[notificationAction1] forContext:UIUserNotificationActionContextMinimal]; NSSet *categories = [NSSet setWithObjects:notificationCategory, nil]; UIUserNotificationType notificationType = UIUserNotificationTypeBadge | UIUserNotificationTypeSound | UIUserNotificationTypeAlert; UIUserNotificationSettings *notificationSettings = [UIUserNotificationSettings settingsForTypes:notificationType categories:categories]; [[UIApplication sharedApplication] registerUserNotificationSettings:notificationSettings]; UILocalNotification* localNotification = [[UILocalNotification alloc] init]; localNotification.fireDate = [NSDate dateWithTimeIntervalSinceNow:10]; localNotification.alertBody = @"Testing"; localNotification.category = @"Email"; // Same as category identifier [[UIApplication sharedApplication] scheduleLocalNotification:localNotification];
这是一段发送本地通知的代码，其中涉及到了这次更新的几个类，
UIMutableUserNotificationAction，UIMutableUserNotificationCategory，UIUserNotificationSettings
我们需要依次生成这几个对象，最后使用[[UIApplication sharedApplication] registerUserNotificationSettings:notificationSettings];把程序的通知设定注册到系统中去。
注意，当应用程序在前台时，通知到来，系统不会为程序弹出alert，而是会调用相应的didReceiveLocalNotification 和
didReceiveRemoteNotification 这2个代理函数，把通知内容交给程序自身处理。而当程序不在前台时，系统才会为用户弹出alert，提示用户进行相应操作。 这里
UIMutableUserNotificationAction就代表了一个操作，在界面上的表示形式就是一个按钮，当点击按钮时，就会调用
- (void)application:(UIApplication *)application handleActionWithIdentifier:(NSString *)identifier forLocalNotification:(UILocalNotification *)notification completionHandler:(void (^)())completionHandler 或者
- (void)application:(UIApplication *)application handleActionWithIdentifier:(NSString *)identifier forRemoteNotification:(NSDictionary *)userInfo completionHandler:(void(^)())completionHandler NS_AVAILABLE_IOS(8_0);
不会再调用
didReceiveLocalNotification 和
didReceiveRemoteNotification 这2个代理函数了。
在
UIMutableUserNotificationAction 中有一个属性，
activationMode，当它是UIUserNotificationActivationModeBackground时，系统会选在在后台执行代码，执行的时间是有限的，我测试的是30s，如果超过30s你的程序还在后台执行，那么系统会终止调你的程序，并抛出异常。异常如下
<Warning>: <BKNewProcess: 0x17e685f0; -.bbbb; pid: 922; hostpid: -1> has active assertions beyond permitted time: {( <BKProcessAssertion: 0x17d6b4f0> id: 42-2B9D290F-7F21-4DCB-955B-9D80DE693382 name: Notification action process: <BKNewProcess: 0x17e685f0; -.bbbb; pid: 922; hostpid: -1> permittedBackgroundDuration: 30.000000 reason: notificationAction owner pid:42 preventSuspend preventThrottleDownUI preventIdleSleep preventSuspendOnSleep , <BKProcessAssertion: 0x17d6de50> id: 42-707C3B54-51BC-47DA-B779-B11888416FE4 name: Deliver Message process: <BKNewProcess: 0x17e685f0; -.bbbb; pid: 922; hostpid: -1> permittedBackgroundDuration: 10.000000 reason: suspend owner pid:42 preventSuspend preventThrottleDownCPU preventThrottleDownUI preventSuspendOnSleep )}
注意，如果你没有点击action按钮，而是通过点击通知内容本身，那么系统扔会像ios7一样，调用
didReceiveLocalNotification 和
didReceiveRemoteNotification 这2个代理函数。
如果程序没有启动，用户点击action按钮后，系统会先调用
didFinishLaunchingWithOptions启动程序，再调用
- (void)application:(UIApplication *)application handleActionWithIdentifier:(NSString *)identifier forLocalNotification:(UILocalNotification *)notification completionHandler:(void (^)())completionHandler 或者
- (void)application:(UIApplication *)application handleActionWithIdentifier:(NSString *)identifier forRemoteNotification:(NSDictionary *)userInfo completionHandler:(void(^)())completionHandler NS_AVAILABLE_IOS(8_0);
来处理action，这一点和以前点击通知内容本身的效果一致，都会先启动程序，再调用相应函数。
iOS8 中的通知：Notification 草稿，正在整理中。。。。